Houkago no Kyoushitsu ni, Koi wa Tsumoru.

"Sensei, you're the one who made me feel this way." Today, Meisa Uehara, the most popular girl in class, once again confesses love to her introverted and plain-looking Japanese teacher. "As your teacher, I can't respond to your feelings." "Only because you're my teacher, not as a woman? Well, maybe when I graduate then." "Alright, sensei. Let's go on a date some time. I'll pick out a cute outfit for you." "Uehara-san, have you listened to anything I said?" Despite her protests, they spend Christmas together, sleeping in the same bed, accept a kiss on the wrist, and starts feeling anxious when Uehara doesn't call. She doesn't want to admit it. but she has fallen hopelessly in love with her student, who is seven years younger. It would be a relationship that crosses the line. A student x teacher age-gap girls' love story. (Source: Fantasia Bunko, translated)